306221136 has 80 divisors (see below), whose sum is σ = 902067264. Its totient is φ = 88676352.

The previous prime is 306221129. The next prime is 306221137. The reversal of 306221136 is 631122603.

It is a happy number.

306221136 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306221137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3826 + ... + 25041.

Almost surely, 2^306221136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 306221136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451033632).

306221136 is an abundant number, since it is smaller than the sum of its proper divisors (595846128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

306221136 is a wasteful number, since it uses less digits than its factorization.

306221136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28908 (or 28902 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 306221136 is about 17499.1752948532. The cubic root of 306221136 is about 674.0286979243.

Adding to 306221136 its reverse (631122603), we get a palindrome (937343739).

The spelling of 306221136 in words is "three hundred six million, two hundred twenty-one thousand, one hundred thirty-six".